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Show PART II PRESENT STATUS Table 9 - Regional Summary of 1965 M&I Withdrawal Requirements by System and Source Total System Source Withdrawal Groundwater Surface Water Requirement System______________(acre-feet) (acre-feet)__________(acre-feet) Municipal 21,350 46,550 67,900 Rural-Domestic 4,100 400 4,500 Self-Supplied Manufacturing, Commercial and Governmental 4,100 12,500 16,600 Livestock 1,100 33,800 34,900 Regional Total 30,650 93,250 123,900 Municipal systems serve domestic, manufacturing, commercial, govern- mental and some livestock water uses. An estimated population of 260,800, or 78 percent of the Regional population including the hydrologic area of Arizona was served by 192 municipal systems in 1965. 1/ The average municipal withdrawal requirement excluding reservoir evaporation was 239 gpcd. There were 181 municipal systems with an independent source of supply of which 96 (53%) utilized a groundwater source, 74 (41%) utilized a surface water source, and 11 (6%) utilized a combination ground-surface water source. 2/ There were at least 11 municipal systems which were dependent upon other municipal systems for their supply. Sixty-eight percent of the Regional municipal withdrawal requirements was supplied by surface water sources. The remainder was supplied by groundwater sources. The number of independent municipal systems serving various population ranges is shown in Table 10. 1/ The total number of municipal systems in the Region was compiled from numerous sources and is not considered to be all inclusive. References: 10, 14, 19, 29, 35, 36, 40. 2/ Many municipalities use an underground infiltration gallery in the alluvium of a surface stream as a source of supply. Although most of these infiltration galleries were considered as groundwater sources for convenience, the interconnection of the groundwater and surface water in these cases makes such a distinction super- fluous. Also, many municipalities with a combination ground-surface water source use one source only except in case of emergency. 23 |
